Isotactics polyfluorene - Monomers, Polymers, Diblockcopolymers

拟建项目的目标是合成、分离和表征等规聚芴。这个研究项目已经进行了两年，还没有得到资助。极性取代基的引入（如i-PF8-2CN中的氰乙基）将引起侧链的偶极相互作用，并应导致固体有序度的增加。此外，我们将研究在等规聚芴中ß-相形成的可能性。在此基础上，棒状/棒状全共轭二嵌段共聚物将通过端接单溴聚（3-烷基噻吩）大单体和手性ab型芴单体的“接枝”聚合合成。它们的光学、热学和填充性能将与由相应的外消旋氟单体制成的全共轭嵌段共聚物进行比较。因此，具有极性聚噻吩嵌段（例如具有膦酸酯侧链）和非极性聚芴嵌段的两亲性体系由于其特定的自组织行为而引起了人们的兴趣。将详细研究所得嵌段共聚物的光学和手性性质，特别是由对称性降低引起的手性诱导效应。

Targets of the proposed project are the synthesis, isolation and characterization of isotactic polyfluorenes. This research project has been running for two years and is not yet funded. The introduction of polar substituents (e.g. cyanoethyl-group in i-PF8-2CN) will cause the dipolar interaction of the side chains and should lead to an increased solid state order. Furthermore, we will investigate the possibility of ß-phase formation in isotactic polyfluorenes. Further on, rod/rod-type all-conjugated diblock copolymers will be synthesized in a „grafting from“ polymerization using a monobromo-terminated poly(3-alkylthiophene) macromonomer and chiral AB-type-fluorene monomers. Their optical, thermal and packing properties will be compared to all-conjugated block copolymers made from the corresponding racemic fluorine monomers. Hereby, also amphiphilic systems with a polar polythiophene block (e.g. with phosphonic ester side chains) and non-polar polyfluorene block are interesting due to their specific self-organization behavior. The optical and chiroptical properties of the resulting block copolymers will be investigated in detail, especially for chiral induction effects caused by the reduced symmetry.